成果報告書詳細
管理番号20150000000323
タイトル*平成26年度中間年報 水素利用等先導研究開発事業 高効率水素製造技術の研究 高温水蒸気電解システムの研究
公開日2015/12/22
報告書年度2014 - 2014
委託先名株式会社東芝
プロジェクト番号P14021
部署名新エネルギー部
和文要約
英文要約Title : Leading Research and Development Program for Hydrogen Utilization etc / Study of Highly Efficient Hydrogen Production Technology / Study of High-Temperature Steam Electrolysis System (FY2014-FY2015) FY2014 Annual Report

One of the important features of the high-temperature steam electrolysis method is that the heat can be used for electrolysis energy in addition to the electricity in a practical way. Consequently, it improves the efficiency of the hydrogen production compared with the alkaline or the solid polymer membrane electrolysis methods. Furthermore, there is a possibility to establish the highly efficient charge-discharge power storage system, by adopting the high-temperature steam electrolysis and the solid oxide fuel cell electric generation with the cyclic heat usage in the system. The purpose of this study is to demonstrate the high efficiency for the high-temperature electrolysis adopting systems. The cell and the cell-stack technologies, the hydrogen production system and the power storage system are studied.
(1) Cell and cell-stack technology development / Based on the results of the FY2013 development, some electrolysis mode I-V properties, which were the durability and the dependences for the operating temperature, the gas flow and the gas composition, were evaluated for the developed 7cells-stacks. Also the trial fabrication for increasing the number of cells for a stack was tested, and the 30cells-stack was successfully manufactured. The 30cells-stack showed the better I-V property against the target property of over 0.5 A/cm2 at 1.3 V for a cell. The dependences for the gas flow and the gas composition were recognized considerably small in the ranges of 4.3–8.6 L/min for H2O/H2=90/10 vol% and 70–90 vol% for 8.6 L/min, respectively. Some heat and mechanical properties of the cell and the cell-stack were investigated or measured, for providing the system design.
(2) Hydrogen production system / Based on the results of the FY2013 development, the design study of the high-temperature module for 150kW-class system was progressed. The heating equipment assembly of using two types of heater was designed. The typical material properties for the high-temperature equipments were investigated and the heat exchangers were designed. The compact design of the system was studied from the aspect of the transporting and the assembling capabilities. Also the system simulator was developed applying the results of the “chemical reaction–electricity–heat flow“ coupling analysis for the cell and the cell-stack, and the system operation and controlling properties were begun to analyze. The mock-up test equipments for the high-temperature module were fabricated, and the properties of the gas flow distribution, the steam pressure loss and the temperature distribution were evaluated. For the multi cell-stack test scheduled in the FY2015, the testing plan and the equipment were reviewed.
(3) Power storage system / Based on the results of the FY2013 development, the elemental tests and the design studies for two types of systems were progressed. One was the system using the high-temperature heat storage equipment and another was the system linked with chemical hydride system. For the former system, the structure of the heat recovery from SOFC was investigated. And the properties of the heat insulation material were evaluated for providing the component test scheduled in the FY2015. For the latter system, the structure of the heat recovery from SOFC was also investigated.
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